gear ratio bigger tires nitro rustler

[Alexander_0_1]

The clutch mounted on the engine, will reduce the strain on your rig, they also have slipper clutches, both of these reduce ware on your rig, try the tires you like, and if you notice it's not performing the way you want then go for the bigger spur gear, and a smaller clutch bell, at least you'll have extra parts!, no one can really tell you what's right for the way you R/C your set up is your set up. The best anyone can do is offer suggestions from their own experience with certain parts/set ups. I had this same problem until I realized more parts is much more preferable than less parts.

 

[Rolex]

This is not an exact science unless you're the engineer. Even then it's tested.
Hardly anyone on this site runs a stock setup. All you can do is try it. If it's what you want, use it. If not, or it overheats, change the spur as suggested.

 

[Nitro4910]

The rollout ratio of your stock rustler with a 3.3in tire & a spur/cb of 70/20 is 1.09.
The closest to stock using the new tires you need a spur/cb of 70/14 gets you a rollout of 1.11.

If your stock tires are larger then the 3.3in I used then you will need to put that into the rollout calculator to get the right stock rollout.

A 14 tooth CB will get you close if your stock tires are 3.3in tall.
This will get you very close to your out of the box configuration with the new taller tires.

Here is the site to figure out the rollout, just plug in you numbers to calculate the unknown for your truck as it sits stock, then change the tire size to get the new number, the change the spur/cb tooth count till you get close to the stock rollout number.
http://scriptasylum.com/rc_speed/rollout_ratio.html

 

[Alexander_0_1]

Man that's handy, the rollout for my MERV is "1.15" now how do I use this number to reduce overheating cause of extra weight that I may or may not add to the rig?

 

[Nitro4910]

Man that's handy, the rollout for my MERV is "1.15" now how do I use this number to reduce overheating cause of extra weight that I may or may not add to the rig?

It's not handy for extraweight, unfortunately.

For taller/shorter tires or trany/diff gear change up it's the ticket.

For say putting 1/8 scale diff in your e maxx BL & want to get back close to stock gearing it works well.

 

[Alexander_0_1]

I bookmarked it for safe keeping!

Thanks again

 

[Rolex]

Bookmarked here, too.
Thanks for that link.

 

[frickenjoey]

Rolex ... All that tells me is ratios... How do I know which ratio to run with certain sized tires.

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Try it... if it no workie....try something else. They call it trial and error for a reason. 99% of us learned by that method.

 

[SchrodeMode]

Did you ever try them out? Did you change your gearing, or did you find some leprechaun tears?

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[frickenjoey]

If you can't find leprechaun tears you could try midget spit.... will not work as well, but worth a shot.

 

[SchrodeMode]

If you can't find leprechaun tears you could try midget spit.... will not work as well, but worth a shot.

Midget spit does work, but it is harder to tune and has a tendency to burn plugs up slightly faster. Depending on the source midget's diet, it may slightly discolor the piston....this doesn't affect performance, but it is something to keep in mind.

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[frickenjoey]

That is what I heard. Free range midgets are the best but either way if you use cold plugs, retune and use lots of aftertun oil you will be fine.